CVE-2026-7273
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA stack-based buffer overflow in the CGI program of Zyxel GS1900-48HPv2 firmware (versions through 2.90(ABTQ.1)C0) allows a LAN-based unauthenticated attacker to execute OS commands via crafted HTTP requests.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the device modelAccess the device web interface or check the physical device label to confirm the exact model is GS1900-48HPv2Affected if The device is a Zyxel GS1900-48HPv2 switch
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Check the installed firmware versionLog into the web management interface and navigate to Administration > Firmware Upgrade to view the current firmware version, or use the command-line interface and run 'show system-info'Affected if The firmware version is 2.90(ABTQ.1)C0 or any earlier version
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Verify web CGI interface is enabledConfirm the web-based management interface is enabled by checking System > WWW > HTTP/HTTPS settings in the web interface or via CLI commandAffected if HTTP or HTTPS management is enabled and accessible
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Assess network exposure of management interfaceCheck if the management interface is accessible from untrusted networks by reviewing VLAN configuration, IP addressing, and whether the management IP is on an isolated VLAN or shared with user trafficAffected if The management interface is reachable from untrusted or guest network segments
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Look for signs of compromiseReview system logs under Administration > Log for any unexpected commands, unusual CGI request patterns, or unauthorized admin account changesAffected if Logs show unexpected CGI requests, command injection patterns, or unauthorized configuration changes
You are affected if you have a GS1900-48HPv2 device running firmware version 2.90(ABTQ.1)C0 or earlier with the web management interface enabled and accessible from your network
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply vendor firmware patch when available; otherwise restrict management interface access to trusted LAN hosts only.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-7273 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-7273 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data